Definitions

1. adjective

swollen or puffed up, especially with something such as blood or fluid

“The upswollen lumps on her skin were a sign of an allergic reaction.”

2. verb

to become or cause to become swollen or puffed up

“The insect bite began to upswell, causing her to itch severely.”

3. verb

to fill or become filled with a fluid, such as blood or water

“The wound began to upswell with fluid, requiring immediate medical attention.”